Destructive play keystone bosses become immortal in the chimera guardian map

When maven summons the other bosses soemtimes one or two can go to the elevated place of the pit like the chimera does between phases, the problem, is that they never go down, here some screenshoots.(if i recall correctly this bug also happened back when the "guardians aid" keystone existed).
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Also (it could be only bad luck tho) when i first allocated the keystone, use it one time, and then deallocate i notice that the number of invitations the guardians were dropping were heavily reduced (not to say 0) in arund 3 rotations, problem here is that i had wandering path with 96% inc invitation drop chance, before that i was dropping 1-2 invitations.